Process of making pyrites briquets.



To all whom it may concern: v

' urrnn srnrss mm PIERRE DE PEYSTER aionn'r'rs Ann o 'coBB n iififorunw YORK, N. Y., ASSIGNORS 'ro NATIONAL METALLURGIG COMPANY, or JERSEYOI-TY, new JERSEY, A CORPORATION OF NEW JERSEY.

Beit known that we, PIERRE DE P'nrs rnn RIoKnr'rs and TOM COBB KING, both citizens of the United States, residing at NeW'York, in the borough of Manhattan'andState of,

New York, have gointl' :discoveredor invented a, new am use 111 Improveme'ntan' Processes for Making P rites Briquets, of which the following is aescription.

Our invention relates to methods of preparing and treating-"pyrites fines for use in urners or kilns for desulfurizing.

The object of our invention 1s 'to produce fromfdpyrites. fines, hardened, artificially forme mps, shapes or bodies of pyrites,

free from extraneous harmful bindin ingre d1ents, and possessing the following eatures or characteristics, viz: density and hardness suficient to prevent crumbling or crushin in sessing the characteristics heretojore herein shipment or handlini substantially an yt e.

drous in character, refore not liable to disintegrate when brought in contact with moisture, not liable during burning to create a dust like material liable to contaminate the acid "reduced therefrom, and finally ossessin I t e characteristic of burning freey in an or inary burner or kiln. We accomplish this object by means of the method or processof treating p rites fines which consists of mixing with the mes a re uisite quantity i. a, about 8 to 12 per cent. 0 sulfur, which when made viscous'or liquid, as hereinafter more specifically described, permeates the mass,

cohering the particlesthereof'ano} when cool converting the same into a solid (body, pos- Pyrltes fines exist in large (p entities and are constantly being produce s' there are .many deposits of ore 1n WlllOll t e ore is so am has been attended with serie'ius difliculties, as, for instance, loss in transportation of the fines, due was finelyv divided condition of the material contamination of the acids produced therefrom, occasioned by the pres ence'therein ofnumerous particles of dust like material carried overfrom the kilns or burners into the lines and Glover towers, and finally, owing to the pulverulent nature of the material, the dilliculty of maintaining of piyrites fines in the manufacture of sulfuric scribed solidifyt e'sanie."

We are'aware that lime-and magnesia Hav been employed to bind er-co l ere-the fines;

rnocsss rinsrrss smenn'rs.

Patented July 28, 1908 free-combustion, and'of preventing the com- 'plete cessation of combustion (which occurs quite frerl uently unless prevented by the use of'specia burners). j j

" It wa'suitegenerally recognized that the best ossi le wa to-utilize or pre are the fines or desulfuri'zing was to form t e same into lumps, and numerous efforts have been made to cohere or form p ites fines into solid lumps or bodies, and w e successful in sofar as the production of forms or'fbriquets pf su'ficient hardness to bear transportation as concerned, these efforts failed utterly ts -reducehardened lu'm s or forms of pyrites ee from extraneous stances, and without reducing the percent age of sulfur contained in the fines. The present invention successfully "accomplishes this object. j

the practice of our invention we takc' thafines' and mix therewith a requisite quantity or percentum of sulfur and 'subject the mixture to heat without access of air or in a reducing atmosphere, thereby taking adv-an armful binder sub tage of the fusing temperature of thesulfur,

which is lower than the fusing tern ierature of. the pyrites' fines; The sulfur econies liquidor viscous, depending upon the tern" perature to which it is heated (at 114." cent grade sulfur is liquid or mobile; at 230? eon tigrade sulfur is viscous; and at about 800- centigrade sulfur becomes a gas) and permeates or difiuses itself through the materisr and binds the sameintoa coherent ,niasls when the mlxture is cooled, the sulfur binder becoming solid when cold;

In the practice of our invention to produce the shapes desired, we take the pyrites fines plus the sulfur and'place the mixture r. retort or mold'which can be closed and apply heat-thereto externally,-adding pressure if desired, until the bindingv material fuses throughout the mass, usinjgonl sufficient heat to soften or H uefy' the su fur binderv without liquefying t e yrites fines. We then remove the mold.- an] allow the cbnten ts of the same to cool. 01' the mixture may be pressed into briquets and in this form heated in a closed vessellor in a reducing atmosphere until the sulfur binder becomes viscous heretofore de or liquid, then b cooling as ioo , into lumps, or bodies ofsuflicient hardness to bear transportation, but the mixture of the lime and magnesia not only impaired the burning capacity of the pyrites, but also 5 introduced therein a foreign element which at"v certain tem eratures served to effect stable compounds with the sulfur, thus reducing the percentum of sulfur in the lump or bodyvformed. We are also aware that- 9 ferrous and lead sulfates have been used as binders, producing a product sufficiently firm 3 or hard for trans ortation. The use of these materials as bin ers was objectionable, however, inasmuch as their use introduced for- 15 eign materials, which not only impeded the free burning of the pyrites, buti'v'that is more objectionable, the said materials being absorbents of moisture, prevehted the-formation of a lump or shape, anhydrous char- 20 acter, the produced body disintegrating when exposed to .damp weatheror when brought in contact with moisture. Another objection to these materials as binders is that [the absorption of moisture interferes with scenes air being excluded during the application of the heat, then cooling.

2. The herein described methbd of we 3,

paring pyrites fines for desulfurization, w liCll consists in adding to the fines and mixing therewith sulfur, subjecting the mixture to the requisite-heat, in a reducing atmosphere,

then cooling. 4(

In. testimony whereof, wehave hereunto signed our names in the presenceof two subscribing witnesses.

' PIERRE DE PEYSTER. RICKETTS.

TOM COBB KING. In the presence of a W. B. Gnmrme,

Ones. E. GRILL. 

